Speed-transmission mechanism.



L. J. CAMPBELL. SPEED TRANSMISSION MECHANISM.

APPLICATION TILED JAN.23, 1911.

1,035,152. Patented Aug. 13, 1912.

2 SHEETS-SHEET 1.

L. J. CAMPBELL.

SPEED TRANSMISSION MEGHANISM.

APPLICATION FILED JAILZS, 1911.

Patented Aug. 13, 1912.

2 SHEETS--SHEET 2.

yimwaes [mien w r f/M w [1 Cam/3M wwk; 6 /0. ALLOW LEON J. CAMPBELL. OF CHICAGO, ILLINOIS.

SPEED-TRANSMISSION MECHANISM.

Specification of Letters Patent.

Patented Aug. 13,1912.

Application filed January 23, 1911. Serial No. 604,060.

To all whom "it may concern:

Be it known that I. Leos J. CAMPBELL, a citizen of the United States, and a resident of Chicago, in the county of Cook and State of Illinois, have invented a newand useful Improvement in Speed-Transmission l\'lecl1- anism. of which the following is a complete specifica ion.

The i'lyun objects of this invention are to provide an improved speed transmission mechanism which is capable of being ad j usted very quickly and easily from one speed to another; to provide an improved speed transmission mechanism which is so constructed that the wear on the transmission gears is practically eliminated; to provide improved mechanism for locking the transmission gears to the transmission shaft; to provide improved meansfior'shifting the locking mechanism for the transmission gears; and to provide a speed transmission mechanism in which the drive gears are adapted to run idle when the locking met-ha nism for the transmission gears is being shifted- A specific construction embodied in said invention is illustrated in the accompanying drawings, in which: Figure 1 is a horizontal section of a speed transmission mechanism embodied in this invention. Fig. 2 is a horizontal section of part of the transmission gears showing one form of hearing for the gears on the trans mission shaft. Fig. 3 is a view similar to Fig. 2. but showing a slightly modified form of bearings for the transmission gears. Fig. .4 is a fragmentary, perspective view of one of the transmission gears. Fig. 5 is a fragmentary side elevation of one of the locking keys. Fig. 6 is an end elevation of the locking end of said key. Fig. 7 is a side elem; tion of the other locking key. Fig. 9' is an end elevation of the locking end of the key shown in Fig. 7. Fig. 9 is an end elevation of the transmission shaft and the locking keys. Fig. 10 is an end elevation of the transmission shaft with the locking keys shown in section through their spindles. Fig. 11 is a fragmentary plan view of the key operating end of the transmission shaft. Fig. 12 is a Section taken on line 12---12 of Fig. 11. Fig. 13 is a fragmentary side elcvation of the drive shaft and the operating lever and. fork.

In the construction shown. the gear casing 1 is provided with bearings 2 for the drive shaft and with bearings 4 for the transmission shaft 5. which is parallel to the drive shaft. Rigidly secured onthe drive shaft. at one side of the casing 1. is a friction disk 6, and journaled on said shaft and extending through the bearings 2 is a sleeve 7. which is provided on its end adjacent to the disk (3 with a friction disk 8. which together with the disk 6 forms a. clutch adapted to lock the drive gears to the drive shaft. Rigidly secured on the sleeve 7. within the casing l, are the drive. gears 9. 10, 11 and 19, which decrease in size in the order named. lligidly secured on the transmission shaft 5, within the casing 1, are the bearing icollars 13 which are constructed of hard metal and are spaced a distance apart. The transmission gears H. 15. 16, and 17 increase in size in the order named and are mounted on said collars. 'lhe gears H. 15 and 16 mesh respeclively with the drive gears f), 10, and 11, and the reverse "car 17 meshes with an idler pinion 13 which is journalcd on a. hearing 19 on the casing and meshes with the drive gear 19. The transmision gears are putvided in their sides with recesses '20 to re ceive the hearing collars 13, thereby leaving a central portion 21 which extends between the bearing collars but does not contact with the shaft. in each of the central portions 21. is a locking recess 22 which extends partially around the shaft.

The shaft 5 is provided with oppositely disposed, longitudinally extending key seats 25 and Q-l. in which are slidably and rockahly mounted the locking keys and 26. The inner surface of said keys formed on the same circle as the kev seats, and the outer surface of the body 27 of the key is,

formed on a smaller curvature than that o? the shaft. so that the edges of the body 0 the key will not be rocked out of the seat in any position of the key. Thclmy 23 whicli locks the gears 14- and 16 to the shaft 0, need only rock in one direction to lock said gears Said key is provided near its inner end with y a locking lug '28 which is adapted, when the key is in locking position, to extend up into the recess of the gear to lock the gear tit the shaft. At the end of each recess 23 which IS. directed rearwardly of the direction of travel of the gear is an abutment Q frombecoming wedged in the recess "turn the lug l ll ism plate 29 adapted to take the wear of the lug 28 on t e gear. The ends 30 of the lug 28 are beveled longitudinally of the key, so that when the key is moved longitudinally of the shaft from locking to release position said beveled ends will bear against the edges of the collars l3 and rotate the key to bring out of the recess 22. At each end of the lug is a shoulder 31 which is of less height than the lug but of greater height than the edge of the body 27. The shoulders 31 are adapted to bear on the inner sides of th bearing collars 13 when the lug is in locking position and prevent the lug The key 26 rocks in one direction to lock the gear to the shaft- 5 and in the opposite direction to lock the gear 17 to the shaft. 1% is therefore provided with a locking lug 32 on each side, at the ends of which are shoulders 33 similar to the shoulders 31.

For the purpose of shifting the keys and 26 longitudinally of the shaft to bring the in the locking lugs into register with the various transmission gears, they are each provided near their outer ends with lugs 34; between which is loosely mounted a grooved collar 35, in which is a fork 36, and pivoted to the fork is a lever 37 which is adapted to move the keys longitudinally. At the outer ends of the keys 25 and 26 are the spindles 38 and 39 respectively, and loosely mounted on the end of the spindle 38 is' a tension collar d0. The side of the collar I 40 which is adjacent to the shaft 5 is of a to seat in the key seat 23, and the thereby proon the shaftas shown in is secured at atthe other other side is of a larger size, viding shoulders 41 which hear at the sides of the key seat Fig. 9. A. coiled spring 42 one end to the collar a0 and end to the outer lug 34. so mounted on the spindle 38 that when the key is in its seat and the shoulders ll of the collar lO arc resting on the shaft 5 atthe sides of the key seat 23, the spring will tend to rotate the key in the direction to 28 into locking position.

On the spindle 39 0f the key are loosely mounted the tension collars 4:3 and at, the fornier of which is at the outer end of the spindle, and the latter at the inner end adjacent to the outer lug 34. Each of said tension collars d3 and 4 A is provided in one side with a recess 45, and pins &6 are carried on the spindle and extend into said recesses and limit the rotative movement of the collars on the spindle. i7 is mounted on the spindle 39 and is so cured at its ends to the collars 4-3 and l t. lhe collar 43 is provided with oppositely disposed shoulders 48 and d9 which are sad oted to bear on the shaft at seat 24c, and the collar or is provided rmilar shoulders 50 and 51.

with

The spring 4:2 is v A. coiled spring the sides of An inclined cam surface 52 is formed in the shaft at one side of the key seat 24 and extends from the outer end of the seat longitudinally of the shaft and emerges to a point slightly beneath thbottom of the seat.

When the keys are at their outer limit of -niovement on the shaft 5 one of the locking lugs 32 of the key 26 is tilted up into the locking recess 22 of the reverse gear 17. In that position the shoulder 50 of the tension collar ll rests on the side of the key seat 24. in position to enter the cam surface 53, while the collar -13 is thrown over to the right by the tension of the spring, as shown in Fig. 9, with the leftside of the recess 4-5 engaging the pin 46' and tending to rock the key into locking posit-ion. lVhen the keys are moved inwardly on the shaft 5 the shoulder 49 contacts the cam surface 52 and tends to rotate the collar 43 to the left. When the shoulder 50 has traveled part way down the incline the tension of the spring has relaxed and become neutral and the pins are both about the center of the rccesses to. Further inward movement of the keys brings the shoulder incline 52, and the shoulder 50 to the bottom of the incline 53 where the tension of the spring is reversed and acts to rot-ate the hey 26 in the opposite direction to move the lug 32 into the locking recess 22 of the ear 15. f

For the purpose of releasing the friction clutch and thereby disconnecting the drive gears from the drive shaft when the speeds are being changed, the sleeve 7 is provided at its end opposite from the clutch with a .fiange 54, and non-rotatively mounted on the shaft 3 and inclosing said flange is an anti-friction coupling 55. A fork 56 has its arms connected at their inner ends to said coupling, and are connected together at their outer ends by an operating lever 57 which extends upwardly from the shaft. At the rear end of eacl1.arm is a heel 58 which, when the lever is down, is adapted to bear against a strong spring 59 which is carried on a collar or washer 60, which is held in adjusted position by means of a nut 61. When the lever is raised to bring the heel out of contact with the spring 59 the clutch member 8 will release its grip on the clutch member 6, and when the lever is atthe lower limit of its movement the spring 59 forces the clutch members together.

The lever 37 is pivoted one end at 62 to any desired support, and aforkedlGver 63 is pivoted atone end 64- to a suitable sup- At. the side of the key 49 to the top of the iaa port; at a, point 'intern'iediate the shafts 3 and 5 near the casing 1, and its forked end straddles the lever 57. connecting link (it? is pivoted at; its ends to the levers It? and G3 atpoints "intermediate the shafts.

If preferred ball bearings (3T may be mounted between the hearing collars l3 and the transmission gears, as shinvn in Fig. 3, in which case the gears are provided with suitable ball races (:38.

The operation of the constructimi shown as follows: \Vhcn it is desired to change the speeds the upper end of the lever 57 is thrown toward the casing 'l, thereby raising the heel .58 out of metalwith the syn-lug 5!) and disconnecting the clutch. The lever 57 is then .u'n'rvcd laterally of the shaft: and causes the lever 63 to swing: the lever 37 and move the collar :35 l .n; ;itudinall v of-the shaft 5, thereby shifting; the keys to lock the desired transmission gaar to the shaft 5. As the keys more and bring their lugs to the locking, recess 5255. the spring on the spindle of the proper key snaps the lug up into the reces:- is before described.

While I have shown and described but; one specific embodiunait of my invention, it will he understood that various details of the construction shown may be varied or on'iit'ted without departing from tlic seopc r of the claims.

I. claim: 1. A. speed transn'iissimi mechanism, coin-i prising a drive shaft and a transmission shaft. interineshin r gearsloosely mounted on said shafts, a clutch :lor eollectlvv'il v locking thedrive years to the dr ve shat'tdmeans for in dividnally lot-ling; the transmission gears to the t'ransmisision shaft, and mechanism adapted to release the drive grears from the drive sha it when the locking mechanism. for the tl'21i .-llli-,.l()ll QFQII'S is bein g shifted. r

2. A speed transmission mechanism, comprising; a drive shaft and a transmission shaft. drive n ea rs loosely mounted on the drive shaft, lin-insmission gears loosely mounted on the transmission shaft and meshing with the d rive years. means adapted to collectively lock the drive gears to the drive shaft.rockable keys adapted to selectively lock the transmissimi gears to the transmission shaft, and. mechanism connecting" the locking means for the drive gears with said keys and adapted to release the drive gea rs when the keys are being shifted.

3. A speed transmission mechanism, conr prising); a drive shaft and a transmission shaft, inter-meshing drive and transmission gears loosely mounted on said shafts. means adapted to collectively lock the drive gears to the drive shaft. lone'itinlinally movable, rl'ickable keys adapted to selectively lock the transmission gears to the transmission shaft, and means coxmeeting said keys with the locking; mechanism for the drive gears, and adapted when the drive gears are released to shift said keys.

-'l. A speed t ransn'iission mechanism. c0mprising a drive. shaft and a transmission shaft, intermeshiimg gears on said shafts, a friction clutch adapted to lock the drive gears to the drive shaft, longitudinally movable keys on the transmission shaft, having lugs thereon adapted to lock the transmission gears to the transmission shaft. and mechanisn'i connecting said keys and said clutch and adapted to release the clutch and shift said keys.

5. A speed transmission mechanism, comprising a drive shaft, a transmission shaft, a sleeve on the drive shaft, a friction clutch adapted to lock the sleeve to the drive shaft, drive gears rigidly secured on said sleeve, cooperating means on the sleeve and drive shaft adapted to operate the clutch, transmission gears loosely mounted on the trans: mission shaft, and meshing with the drive gears, means on the transmission shaft adapted to lock the transmission gears to said shaft, and operating levers connecting said means with the operating means for the clutch.

(3. A speed transi-nissicm mechanism, comprising; a drive shaft, a sleeve 011 said shaft, a friction clutch adapted to lock the sleeve to the shaft, a plurality of drive gears rigidly secured to the sleeve, a coupling on one end. of the sleeve, a fork connected to said eol'ipline', means 011 the shaft adapted to engage said fork and operate the clutch, transmission gears on the transmission shaft. and means operated by said fork adapted to lock the transmission gears to the transmission shaft.

7. A speed transmission mechanism, c0mprising a drive shaft, a transmission shaft, a plurality of drive gears loosely mounted on'the drive shaft, a clutch adapted to lock said gears to the shaft, transmission gears on the transmission shaft each having a locking recess therein, locking keys slidahly and rockahly mounted on the transmission shaft, and having locking lugs adapted to engage in said recesses when brought into register therewith, a collar slidably mounted on the transmission shaft and engaging said keys, means adapted to operate said clutch, and levers connecting said means with said collar and adapted to operate the keys.

8. A speed transmission mechanism, comprising a transmission shaft having keywa'ys therein, hearing collars rigidly secured on said shaft, transmission gears ournaled on said collars and having locking recesses therein, keys in said keyways, each key having a locking lug, adapted to engage in said recesses. and shoulders at the endsof the lugs adapted to bear against said collars when the keys are in locking position, tell-21' 43. nos

' sion shaft adapted to operate the keys.

9. A. speed transmission mechanism, comprising a drive shaft, a transmission shaft, a plurality of gears loosely mounted on each shaft and intermeshing with those on the other shaft, keys adapted to selectively lock the transmission gears to the CI'HDSYlIlSSlOD shaft, means adapted to collectively look the drive gears to the drive shaft, end 1nechanism connecting said means with saidkeys adapted to operate the keys.

10. A speedtransmission mechanism, comprising a transmission shaft, bearing collars rigidly scoured on said shaft, transmission gears jonrnaled on said collars, means for selectively looking said gears to the shaft, and-means for operating; said gears.-

11. A speed transmission meehanism, comprising a transmission shaft, a plurality of transmission gears loosely mounted on said shaft, a drive shaft, a sleeve loosely mounted on the drive shaft, a plurality of drive gears rigidly, secured on said sleeve in mesh with the transmission. gears, enacting means on the sleeve and drive shaft adapted to lock the sleevetothe shaft, and mechanism connected with said sleeve adapted to selectively lock the transmission gears to the transmission shaft.

In witness whereof l. scribed in name in the presence of two Witnesses.

LEUN J. CAMPBELL.

l 'l itnesses i Marin VYIPHENBURY, il W. ll rrnnnnnim have hereunto suh- 

